This extension was developed along this blog post:
https://augustin-riedinger.fr/en/resources/thoughts-on-target-blank
Go read it for full-context.

It does basically two things:
1. Changes the cursor to the logo when hovering a `target="_blank"` link
2. Toggles the `target="_blank"` attributes on links while pressing `Ctrl`/`Cmd` + `Shift`

Install

• License: GNU General Public License v2.0 or later
• Weekly downloads: 1
• Average daily users: 78
• Rating: 4.7143/5 of 14 ratings
• Created: 2017-11-10 12:36:35
• Last updated: 2017-11-14 17:00:22
• Homepage: https://augustin-riedinger.fr/en/resources/thoughts-on-target-blank
• Support site and email
• Orig: https://addons.mozilla.org/en-US/firefox/addon/target-_blank-toggler/
• API: {3ce760d0-7209-41a2-9981-5216731abef0}